feat: config refactor, read evm_version from foundry.toml

foundry.toml

@@ -3,3 +3,4 @@ optimizer = true
 remappings = [
     "examples/=huff-examples/",
 ]
+evm_version = "paris"

huff_cli/src/huffc.rs

@@ -17,6 +17,7 @@ use huff_tests::{
     HuffTester,
 };
 use huff_utils::{
+    config::HuffConfig,
     file_provider::FileSystemFileProvider,
     prelude::{
         export_interfaces, gen_sol_interfaces, str_to_bytes32, unpack_files, AstSpan, BytecodeRes,
@@ -190,6 +191,9 @@ fn main() {
             .collect()
     });
 
+    // Parse external config
+    let config = HuffConfig::new("./");
+
     // Parse the EVM version
     let evm_version = EVMVersion::from(cli.evm_version);
 
@@ -212,7 +216,7 @@ fn main() {
     };
 
     let compiler: Compiler = Compiler {
-        evm_version: &evm_version,
+        huff_config: config,
         sources: Arc::clone(&sources),
         output,
         alternative_main: cli.alternative_main.clone(),

huff_core/src/lib.rs

@@ -11,8 +11,10 @@ use huff_parser::*;
 #[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
 use huff_utils::wasm::IntoParallelIterator;
 use huff_utils::{
+    config::HuffConfig,
     file_provider::{FileProvider, FileSystemFileProvider, InMemoryFileProvider},
     prelude::*,
+    remapper::Remapper,
     time,
 };
 #[cfg(not(all(target_arch = "wasm32", target_os = "unknown")))]
@@ -59,9 +61,9 @@ pub(crate) mod cache;
 /// );
 /// ```
 #[derive(Debug, Clone)]
-pub struct Compiler<'a, 'l> {
-    /// The EVM version to compile for
-    pub evm_version: &'l EVMVersion,
+pub struct Compiler<'a> {
+    /// Huff Config
+    pub huff_config: HuffConfig,
     /// The location of the files to compile
     pub sources: Arc<Vec<String>>,
     /// The output location
@@ -84,11 +86,11 @@ pub struct Compiler<'a, 'l> {
     pub file_provider: Arc<dyn FileProvider<'a>>,
 }
 
-impl<'a, 'l> Compiler<'a, 'l> {
+impl<'a> Compiler<'a> {
     /// Public associated function to instantiate a new compiler.
     #[allow(clippy::too_many_arguments)]
     pub fn new(
-        evm_version: &'l EVMVersion,
+        huff_config: HuffConfig,
         sources: Arc<Vec<String>>,
         output: Option<String>,
         alternative_main: Option<String>,
@@ -102,7 +104,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
             Compiler::init_tracing_subscriber(Some(vec![tracing::Level::INFO.into()]));
         }
         Self {
-            evm_version,
+            huff_config,
             sources,
             output,
             alternative_main,
@@ -120,7 +122,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
     /// map.
     #[allow(clippy::too_many_arguments)]
     pub fn new_in_memory(
-        evm_version: &'l EVMVersion,
+        evm_version: &EVMVersion,
         sources: Arc<Vec<String>>,
         file_sources: HashMap<String, String>,
         alternative_main: Option<String>,
@@ -132,8 +134,9 @@ impl<'a, 'l> Compiler<'a, 'l> {
         if cfg!(feature = "verbose") || verbose {
             Compiler::init_tracing_subscriber(Some(vec![tracing::Level::INFO.into()]));
         }
+        let huff_config = HuffConfig::from_evm_version(evm_version.clone());
         Self {
-            evm_version,
+            huff_config,
             sources,
             output: None,
             alternative_main,
@@ -226,7 +229,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
                 let recursed_file_sources: Vec<Result<Arc<FileSource>, Arc<CompilerError>>> = files
                     .into_par_iter()
                     .map(|v| {
-                        Self::recurse_deps(v, &Remapper::new("./"), self.file_provider.clone())
+                        Self::recurse_deps(v, self.huff_config.clone(), self.file_provider.clone())
                     })
                     .collect();
 
@@ -307,13 +310,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
 
         let recursed_file_sources: Vec<Result<Arc<FileSource>, Arc<CompilerError>>> = files
             .into_par_iter()
-            .map(|f| {
-                Self::recurse_deps(
-                    f,
-                    &huff_utils::files::Remapper::new("./"),
-                    self.file_provider.clone(),
-                )
-            })
+            .map(|f| Self::recurse_deps(f, self.huff_config.clone(), self.file_provider.clone()))
             .collect();
 
         // Collect Recurse Deps errors and try to resolve to the first one
@@ -358,7 +355,8 @@ impl<'a, 'l> Compiler<'a, 'l> {
                 tracing::info!(target: "core", "└─ TOKEN COUNT: {}", tokens.len());
 
                 // Parser incantation
-                let mut parser = Parser::new(tokens, Some(file.path.clone()));
+                let mut parser =
+                    Parser::new(self.huff_config.clone(), tokens, Some(file.path.clone()));
 
                 // Parse into an AST
                 let parse_res = parser.parse().map_err(CompilerError::ParserError);
@@ -396,7 +394,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
         tracing::info!(target: "core", "└─ TOKEN COUNT: {}", tokens.len());
 
         // Parser incantation
-        let mut parser = Parser::new(tokens, Some(file.path.clone()));
+        let mut parser = Parser::new(self.huff_config.clone(), tokens, Some(file.path.clone()));
 
         // Parse into an AST
         let parse_res = parser.parse().map_err(CompilerError::ParserError);
@@ -408,7 +406,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
         // Primary Bytecode Generation
         let mut cg = Codegen::new();
         let main_bytecode = match Codegen::generate_main_bytecode(
-            self.evm_version,
+            &self.huff_config.evm_version,
             &contract,
             self.alternative_main.clone(),
         ) {
@@ -436,7 +434,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
         let inputs = self.get_constructor_args();
         let (constructor_bytecode, has_custom_bootstrap) =
             match Codegen::generate_constructor_bytecode(
-                self.evm_version,
+                &self.huff_config.evm_version,
                 &contract,
                 self.alternative_constructor.clone(),
             ) {
@@ -515,7 +513,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
     /// Recurses file dependencies
     pub fn recurse_deps(
         fs: Arc<FileSource>,
-        remapper: &Remapper,
+        config: HuffConfig,
         reader: Arc<dyn FileProvider<'a>>,
     ) -> Result<Arc<FileSource>, Arc<CompilerError>> {
         tracing::debug!(target: "core", "RECURSING DEPENDENCIES FOR {}", fs.path);
@@ -544,7 +542,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
             .into_iter()
             .map(|mut import| {
                 // Check for foundry toml remappings
-                match remapper.remap(&import) {
+                match config.remap(&import) {
                     Some(remapped) => {
                         tracing::debug!(target: "core", "REMAPPED IMPORT PATH \"{}\"", import);
                         import = remapped;
@@ -575,7 +573,7 @@ impl<'a, 'l> Compiler<'a, 'l> {
         // Now that we have all the file sources, we have to recurse and get their source
         file_sources = file_sources
             .into_par_iter()
-            .map(|inner_fs| match Self::recurse_deps(Arc::clone(&inner_fs), remapper, reader.clone()) {
+            .map(|inner_fs| match Self::recurse_deps(Arc::clone(&inner_fs), config.clone(), reader.clone()) {
                 Ok(new_fs) => new_fs,
                 Err(e) => {
                     tracing::error!(target: "core", "NESTED DEPENDENCY RESOLUTION FAILED: \"{:?}\"", e);

huff_parser/src/lib.rs

@@ -6,9 +6,10 @@
 
 use huff_utils::{
     ast::*,
+    config::HuffConfig,
     error::*,
-    files,
     prelude::{bytes32_to_string, hash_bytes, str_to_bytes32, Span},
+    remapper::Remapper,
     token::{Token, TokenKind},
     types::*,
 };
@@ -17,6 +18,8 @@ use regex::Regex;
 /// The Parser
 #[derive(Debug, Clone)]
 pub struct Parser {
+    /// Config
+    pub config: HuffConfig,
     /// Vector of the tokens
     pub tokens: Vec<Token>,
     /// Current position
@@ -27,16 +30,13 @@ pub struct Parser {
     pub base: Option<String>,
     /// A collection of current spans
     pub spans: Vec<Span>,
-    /// Our remapper
-    pub remapper: files::Remapper,
 }
 
 impl Parser {
     /// Public associated function that instantiates a Parser.
-    pub fn new(tokens: Vec<Token>, base: Option<String>) -> Self {
+    pub fn new(config: HuffConfig, tokens: Vec<Token>, base: Option<String>) -> Self {
         let initial_token = tokens.get(0).unwrap().clone();
-        let remapper = files::Remapper::new("./");
-        Self { tokens, cursor: 0, current_token: initial_token, base, spans: vec![], remapper }
+        Self { config, tokens, cursor: 0, current_token: initial_token, base, spans: vec![] }
     }
 
     /// Resets the current token and cursor to the first token in the parser's token vec

huff_utils/src/config.rs

@@ -0,0 +1,71 @@
+use std::{collections::HashMap, fs::read_to_string, path::PathBuf};
+
+use crate::{evm_version::EVMVersion, foundry::FoundryConfig, remapper::Remapper};
+
+/// Stores external configuration options, such as remappings and evm version.
+
+#[derive(Debug, Default, Clone)]
+pub struct HuffConfig {
+    pub base_dir: String,
+    pub evm_version: EVMVersion,
+    pub remappings: HashMap<String, String>,
+}
+
+impl HuffConfig {
+    pub fn new(root: impl AsRef<str>) -> Self {
+        let base_dir = root.as_ref().to_string();
+
+        // Parse foundry config and remappings
+        let foundry_config = FoundryConfig::new(&base_dir);
+        let file_remappings = remappings_from_file(&base_dir);
+
+        let mut remappings = HashMap::<String, String>::new();
+        remappings.extend(file_remappings);
+        remappings.extend(foundry_config.remappings);
+
+        let evm_version = EVMVersion::from(foundry_config.evm_version);
+
+        HuffConfig { base_dir, evm_version, remappings }
+    }
+
+    pub fn from_evm_version(evm_version: EVMVersion) -> Self {
+        HuffConfig { base_dir: "".to_string(), evm_version, remappings: HashMap::new() }
+    }
+}
+
+impl Remapper for HuffConfig {
+    /// Tries to replace path segments in a string with our remappings
+    fn remap(&self, path: &str) -> Option<String> {
+        let mut path = path.to_string();
+        for (k, v) in self.remappings.iter() {
+            if path.starts_with(k) {
+                tracing::debug!(target: "parser", "found key {} and value {}", k, v);
+                path = path.replace(k, v);
+                return Some(format!("{}{path}", self.base_dir))
+            }
+        }
+        None
+    }
+}
+
+// Read remappings from remappings.txt
+fn remappings_from_file(root: &str) -> HashMap<String, String> {
+    let mut remappings: HashMap<String, String> = HashMap::new();
+    let remappings_file = PathBuf::new().join(root).join("remappings.txt");
+    if remappings_file.is_file() {
+        let content = read_to_string(remappings_file).map_err(|err| err.to_string()).unwrap();
+
+        let rem_lines = content.split('\n').collect::<Vec<&str>>();
+        let rem = rem_lines
+            .iter()
+            .filter(|l| l != &&"")
+            .map(|l| l.split_once('='))
+            .collect::<Vec<Option<(&str, &str)>>>();
+        rem.iter().for_each(|pair| {
+            if let Some((lib, path)) = pair {
+                remappings.insert(lib.to_string(), path.to_string());
+            }
+        });
+    }
+    remappings
+}

huff_utils/src/evm_version.rs

@@ -4,15 +4,15 @@ use std::cmp::PartialOrd;
 ///
 /// Determines which features will be available when compiling.
 
-#[derive(Debug, PartialEq, PartialOrd)]
+#[derive(Clone, Debug, PartialEq, PartialOrd)]
 pub enum SupportedEVMVersions {
     /// Introduced prevrandao, disallow difficulty opcode (does not affect codegen)
     Paris,
     /// Introduce Push0, compiler will use by default
     Shanghai,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 /// EVM Version
 pub struct EVMVersion {
     version: SupportedEVMVersions,